Abstract
Carbon nanotubes with rollup vector indices equal, i. e., (n, n) nanotubes, are calculated to be metallic electrical conductors. Several years ago, a toroidal fullerene structure, C576, was proposed and suggested to possess a small bandgap on the basis of its having approximately half of its atoms arranged as in a (4, 4) nanotube. a more recent calculation determined that this structure has a very large anisotropic ring-current diamagnetic susceptibility and is therefore likely to be a good electrical conductor. the present work proposes an alternative structure for C576 which is constructed entirely from six copies of a C96 fragment of a (4, 4) nanotube.
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